Handle/Catch rejects and manage - don't fail promise list fast.

[bstopp]

Description

Add logic to handle rejected items when processing lists. This will allow the UI wait to correctly clear instead of ending early while background processes are still occurring.

Related Issue

Fixes #98.

How Has This Been Tested?

Validated manually through UI testing. (Would prefer unit/automatic tests, but practically impossible)

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #113 (6a743f5) into main (7f6c38f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #113   +/-   ##
=========================================
  Coverage     79.21%   79.21%           
  Complexity      430      430           
=========================================
  Files            34       34           
  Lines          1934     1934           
  Branches        356      356           
=========================================
  Hits           1532     1532           
  Misses          295      295           
  Partials        107      107           

Flag	Coverage Δ
unittests	79.21% <ø> (ø)

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